NVD / CVE Program· CNA microsoft

CVE-2020-0796: A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain…

CriticalCVSS 10.0 · v3.1KEVWeaponized No fix recorded

Noroxi assessment

Priority: Now (action score 100/100)

CISA has confirmed exploitation in the wild (Feb 10, 2022); it is known to be used in ransomware campaigns. Remediation deadline for US federal agencies: Aug 10, 2022.
A ready-made attack module is public (Metasploit, Nuclei); exploiting it takes no special expertise.
Probability of exploitation in the next 30 days: 99.8% (FIRST EPSS); higher than 99.9% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
According to the record, no fixed version is available yet.
Mentioned 6 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Patch today or shut off access. Until a fix is released, restrict access to the affected component and follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests, aka 'Windows SMBv3 Client/Server Remote Code Execution Vulnerability'.

BDU:2020-01005

Published: Mar 12, 2020
Updated: Oct 1, 2026
EPSS: 99.8% · 99th percentile
CWE: CWE-119

Report tools

JSON

Action score

100

Now

Patch today or shut off access.

CVSS: 40 / 40 · 10.0 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 30 / 30 · 99.8%

CISA SSVC decision

Exploitation: active
Automatable: yes
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 10.0
CNA · microsoft: 10.0; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Feb 10, 2022. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Aug 10, 2022.

Known to be used in ransomware campaigns.

Get told when this record changes

In CISA KEV: exploitation in the wild confirmed
Weaponized exploit exists
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
microsoft	windows 10 1903	cpe:2.3:o:microsoft:windows_10_1903
microsoft	windows 10 1909	cpe:2.3:o:microsoft:windows_10_1909
microsoft	windows server 1903	cpe:2.3:o:microsoft:windows_server_1903
microsoft	windows server 1909	cpe:2.3:o:microsoft:windows_server_1909

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

Microsoft Windows 10 Version 1903 for 32-bit Systems
- unspecifiedaffected
Microsoft Windows 10 Version 1903 for ARM64-based Systems
- unspecifiedaffected
Microsoft Windows 10 Version 1903 for x64-based Systems
- unspecifiedaffected
Microsoft Windows 10 Version 1909 for 32-bit Systems
- unspecifiedaffected
Microsoft Windows 10 Version 1909 for ARM64-based Systems
- unspecifiedaffected
Microsoft Windows 10 Version 1909 for x64-based Systems
- unspecifiedaffected
Microsoft Windows Server, version 1903 (Server Core installation)
- unspecifiedaffected
Microsoft Windows Server, version 1909 (Server Core installation)
- unspecifiedaffected

Affected versions · NVD (4)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

microsoft windows 10 1903all versions
microsoft windows 10 1909all versions
microsoft windows server 1903all versions
microsoft windows server 1909all versions

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

Metasploit module ×2
Exploit-DB entry ×3
Nuclei detection template ×1
Proof-of-concept repository on GitHub ×50

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Proof-of-concept repository on GitHub	50 repositories	2019-11-19 → 2020-06-10
Exploit-DB entry	dos	2020-03-14
Exploit-DB entry	local	2020-03-30
Exploit-DB entry	remote	2020-06-02
Metasploit module	exploit/windows/local/cve_2020_0796_smbghostSMBv3 Compression Buffer Overflowexploit	2020-03-13
Metasploit module	exploit/windows/smb/cve_2020_0796_smbghostSMBv3 Compression Buffer Overflowexploit	2020-03-13
Nuclei detection template	Nuclei template CVE-2020-0796	—

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.